I recently upgraded our systems (IP 406 and IP 403 systems) to 3.0(59) from 2.1(27) and I've found that the 4400 phones stopped working. The 4406 and 4412 sets are just fine. Is there a guide somewhere to how these have to be programmed in 3.0? I've tried checking and unchecking idle line preference, and also tried having or not having an appearance button programmed, but nothing seems to work. Thanks for any help.